Steering wheel angle sensor for full-hydraulic steering gear

Abstract

The invention relates to a steering wheel angle sensor for a full-hydraulic steering gear, and belongs to the technical field of sensors. The steering wheel angle sensor aims to solve the problems that an existing steering wheel angle sensor for a full-hydraulic steering gear is complex in structure, tedious in installation and low in sensing precision. The device comprises a mounting shell, a connecting shaft, a sensing unit and an electric control board, a mounting hole and an electric control board mounting position are integrally arranged on the mounting shell, the connecting shaft is rotatably mounted in the mounting hole, and the electric control board is mounted in the electric control board mounting position; the induction unit is of a non-contact induction structure and comprises an induction piece and an identification piece. The identification piece is installed on the connecting shaft, the induction piece is fixedly installed on the installation shell on the outer side of the connecting shaft, the induction end of the induction piece faces the identification piece in a non-contact mode, and the signal output end of the induction piece is electrically connected with the electric control board. The integrated structure is adopted, and the electric control board, the connecting shaft and the sensing unit are integrally installed on the installation shell, so that the rotation angle sensor is simple in structure, convenient to install and high in sensing precision.

Description

Technical Field

[0001] The present invention relates to a steering wheel angle sensor for a full hydraulic steering gear, belonging to the technical field of sensors. Background Art

[0002] The steering wheel angle sensor for a full hydraulic steering gear is a device that detects the rotation angle and rotation direction of the steering wheel and converts mechanical rotation information into an electrical signal output. It is one of the key components in a full hydraulic steering system, used to monitor the rotation state of the steering wheel, provide real-time angle and direction data to optimize the steering operation. It has functions such as real-time detection, signal output, improving steering accuracy, safety assistance, and automation support, and is commonly used in scenarios such as agricultural machinery, engineering vehicles, commercial vehicles, and passenger vehicles.

[0003] The existing steering wheel angle sensors for full hydraulic steering gears have at least the following structural problems: the sensor components are scattered, the induction unit, the connecting piece, and the electronic control area are independent of each other, the installation steps are cumbersome, the positioning requirements are too high, and the sensor accuracy is low. Therefore, a steering wheel angle sensor for a full hydraulic steering gear is needed to solve the problems of the existing steering wheel angle sensors for full hydraulic steering gears, such as complex structure, cumbersome installation, and low sensor induction accuracy. Summary of the Invention

[0004] In view of the problems and deficiencies in the prior art, the present application provides a steering wheel angle sensor for a full hydraulic steering gear to solve the above technical problems.

[0005] To achieve the above object, the present application provides the following technical solution: A steering wheel angle sensor for a full hydraulic steering gear includes an installation housing, a connecting shaft, an induction unit, and an electronic control board. The installation housing is integrally provided with an installation hole and an electronic control board installation position. The connecting shaft is rotatably installed in the installation hole, and the electronic control board is installed in the electronic control board installation position. The induction unit is a non-contact induction structure, which includes an induction element and an identification element. The identification element is installed on the connecting shaft, the induction element is fixedly installed on the installation housing outside the connecting shaft, and its induction end faces the identification element non-contactingly, and its signal output end is electrically connected to the electronic control board.

[0006] Specifically, the induction unit is a magnetoresistive induction structure.

[0007] Specifically, the induction unit is a magnetoresistive resolver, and the magnetoresistive resolver is coaxially installed in the installation housing with the installation hole. The rotor of the magnetoresistive resolver constitutes the identification element, and the stator constitutes the induction element.

[0008] Specifically, the magnetoresistive resolver is a four-pole resolver.

[0009] Specifically, the first connection end of the connecting shaft facing the steering column is connected to the output end of the steering column, and the end facing the steering gear is provided with a second connection end connected to the input end of the steering gear.

[0010] Specifically, the first connection end of the connecting shaft is an internal spline tooth hole, and the second connection end is an external spline tooth shaft.

[0011] Specifically, several mounting through holes are provided on the mounting housing, and several mounting holes are respectively provided at positions corresponding to the mounting through holes on the flange surface of the steering column and the front cover surface of the full hydraulic steering gear. When the mounting housing is mounted on the flange surface of the steering column and the front cover surface of the full hydraulic steering gear, the mounting through holes correspond to the mounting holes one by one.

[0012] Specifically, several pre-assembly positioning holes are provided on the mounting housing, and several positioning pins are respectively provided at positions corresponding to the pre-assembly positioning holes on the flange surface of the steering column and the front cover surface of the full hydraulic steering gear. When the mounting housing is mounted on the flange surface of the steering column and the front cover surface of the full hydraulic steering gear, the positioning holes correspond to the positioning pins one by one.

[0013] Specifically, several positioning columns are respectively provided on the rotor of the reluctance resolver, and several positioning holes are provided at positions corresponding to the positioning columns on the connecting shaft. When the reluctance resolver is mounted on the connecting shaft, the positioning columns correspond to the positioning holes one by one.

[0014] Specifically, the size of the internal spline tooth hole is adapted to the size of the output end of the steering column, and the size of the external spline tooth shaft is adapted to the size of the input end of the steering gear.

[0015] Compared with the prior art, the beneficial effects of the present application are as follows: 1. The steering wheel angle sensor for the full hydraulic steering gear of the present application includes a mounting housing, a connecting shaft, an induction unit and an electronic control board. Among them, the mounting housing is integrally provided with mounting holes and an electronic control board mounting position. The connecting shaft is rotatably mounted in the mounting holes, and the electronic control board is mounted in the electronic control board mounting position. In order to realize an integrated structure, the electronic control board, the connecting shaft and the induction unit are integrally mounted on the mounting housing, so that the angle sensor has a simple structure and is convenient to install. The induction unit of the present application adopts a non-contact induction structure to improve the induction accuracy of the sensor.

[0016] 2. On the basis of the above, the induction unit of the present application adopts a reluctance induction structure, specifically a reluctance resolver sensor. In order to further improve the induction accuracy of the sensor, the present application adopts a multi-pole resolver to further improve the accuracy of the sensor.

[0017] 3. On the basis described above, in order to improve the high-precision installation between the sensor, the steering column, and the steering gear, the connecting shaft of this application is provided with a first connection end and a second connection end to be connected to the steering column and the steering gear respectively. In order to improve the installation efficiency, the installation housing of this application is respectively provided with installation through holes and pre-assembly positioning holes to achieve one-to-one correspondence with the installation holes and positioning holes on the flange surface of the steering column and the front cover surface of the steering gear, making the installation convenient and improving the installation efficiency and accuracy.

[0018] 4. On the basis described above, in order to ensure the installation accuracy between the rotor of the reluctance resolver and the connecting shaft, this application sets a positioning pin on the rotor and a positioning hole at the corresponding position on the connecting shaft. When installing the reluctance resolver, its rotor is quickly positioned through the positioning pin and the positioning hole, enabling the quick positioning accuracy to complete the installation of both, and ensuring the connection stability between the two when the connecting shaft rotates to drive the rotor to rotate.

[0019] 5. On the basis described above, the size of the internal spline tooth hole of this application is adapted to the size of the output end of the steering column, and the size of the external spline tooth shaft is adapted to the size of the input end of the steering gear. This is to facilitate the steering column manufacturer or the steering gear manufacturer to quickly confirm the specification dimensions and improve the product applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the steering wheel angle sensor for a full-hydraulic steering gear in this embodiment; Figure 2 It is a schematic structural diagram of the connecting shaft of the steering wheel angle sensor for a full-hydraulic steering gear in this embodiment; Figure 3 It is a schematic structural diagram of the reluctance resolver of the steering wheel angle sensor for a full-hydraulic steering gear in this embodiment; Figure 4 It is an exploded view of the structure of the steering wheel angle sensor for a full-hydraulic steering gear in this embodiment; Figure 5 It is an installation schematic diagram of the steering wheel angle sensor for a full-hydraulic steering gear in this embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the purpose and advantages of the present invention clearer, the present invention will be specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific implementation manners of the present invention and does not strictly limit the specific scope of protection claimed by the present invention.

[0022] Please refer to Figures 1 - 4, this embodiment discloses a steering wheel angle sensor for a full hydraulic steering gear, which includes a mounting housing 1, a connecting shaft 2, a sensing unit, and an electronic control board 3. Among them, the mounting housing 1 includes a housing 10 and a cover plate 11. The cover plate is fixedly installed on the housing through connecting bolts 5, forming a component mounting cavity therebetween; and the housing is integrally provided with a mounting hole and an electronic control board mounting position. The connecting shaft 2 is rotatably installed in the mounting hole, and the electronic control board 3 is installed in the electronic control board mounting position; the sensing unit is a non-contact sensing structure, which includes a sensing member and an identification member; the identification member is installed on the connecting shaft, the sensing member is fixedly installed on the housing outside the connecting shaft, and its sensing end faces the identification member non-contactingly, and its signal output end is electrically connected to the electronic control board.

[0023] The sensing unit of this embodiment is a magnetoresistive sensing structure. Specifically, it is a magnetoresistive resolver 6. The magnetoresistive resolver is coaxially installed in the housing with the mounting hole, and a sealing ring 7 is installed between the cover plate and the magnetoresistive resolver; the rotor of the magnetoresistive resolver constitutes the identification member, and the stator constitutes the sensing member. In addition, the magnetoresistive resolver 6 of this embodiment is a four-pole resolver.

[0024] Furthermore, referring to Figure 5 , one end of the connecting shaft 2 of this embodiment facing the steering column 8 is the first connection end 2-1 connected to the output end of the steering column, and the end facing the steering gear 9 is provided with a second connection end 2-2 connected to the input end of the steering gear. The output end of the steering column in this embodiment is an output shaft, specifically an external spline tooth shaft, and the input end of the steering gear is an internal spline tooth hole. Therefore, the first connection end of the connecting shaft in this embodiment is an internal spline tooth hole, and the second connection end is an external spline tooth shaft, so that both ends of the connecting shaft are connected to the steering column and the steering gear respectively. And, the size of the internal spline tooth hole in this embodiment is adapted to the size of the output end of the steering column, and the size of the external spline tooth shaft is adapted to the size of the input end of the steering gear.

[0025] In addition, four mounting through holes 1-1 are provided on the mounting housing of this embodiment. Four mounting holes are respectively provided at corresponding positions on the steering column flange surface and the front cover surface of the full hydraulic steering gear. When the mounting housing is installed on the steering column flange surface and the front cover surface of the full hydraulic steering gear, the mounting through holes correspond to the mounting holes one by one. And four pre-assembly positioning holes 1-2 are provided on the mounting housing of this embodiment. Four positioning pins are respectively provided at corresponding positions on the steering column flange surface and the front cover surface of the full hydraulic steering gear. When the mounting housing is installed on the steering column flange surface and the front cover surface of the full hydraulic steering gear, the positioning holes correspond to the positioning pins one by one.

[0026] Two positioning posts 4-1 are respectively provided on the rotor of the magnetoresistive resolver of this embodiment. Two positioning holes 2-3 are provided at corresponding positions on the connecting shaft. When the magnetoresistive resolver is installed on the connecting shaft, the positioning posts correspond to the positioning holes one by one.

[0027] Working principle: When the steering wheel angle sensor of the full hydraulic steering gear in this embodiment is in use, the operator connects the first connection end of the connecting shaft, i.e., the internal spline tooth hole, to the output shaft of the steering column, and connects the second connection end, i.e., the external spline tooth shaft, to the internal spline tooth hole of the input end of the steering gear to complete the installation of the angle sensor. When the steering column rotates during the operation of the angle sensor in this embodiment, it means that the vehicle needs to turn. The operator turns the steering wheel to drive the steering column to rotate, thereby driving the connecting shaft of the angle sensor to rotate, and then driving the rotor of the reluctance resolver to rotate. There is a phase excitation winding and two-phase output windings on the stator of the reluctance resolver, and these windings are fixed in the stator slots. The stator is electrically connected to the electronic control board, and the rotation of the rotor will generate an induced electromotive force through the output windings, thereby changing the output voltage to sense the rotation angle. At the same time, as the connecting shaft rotates, it drives the rotation of the input end of the steering gear. At this time, the vehicle controller will control the rotation angle output of the steering gear according to the induced voltage of the angle sensor, thereby realizing the steering of the vehicle.

[0028] The above has described the embodiments of the present application in detail in combination with the embodiments. However, the present application is not limited to the above embodiments. For those of ordinary skill in the art in this technical field, after learning the content recorded in the present application, without departing from the principle of the present application, several equivalent transformations and substitutions can still be made, and these equivalent transformations and substitutions should also be regarded as belonging to the protection scope of the present application.

Claims

1. A steering wheel angle sensor for a full hydraulic steering gear, comprising a mounting housing, a connecting shaft, an induction unit and an electronic control board, characterized in that: The installation housing is integrally provided with an installation hole and an electronic control board installation position. The connecting shaft is rotatably installed in the installation hole, and the electronic control board is installed in the electronic control board installation position. The sensing unit is a non-contact sensing structure, which includes a sensing element and an identification element. The identification element is installed on the connecting shaft, the sensing element is fixedly installed on the installation housing outside the connecting shaft, and its sensing end faces the identification element in a non-contact manner, and its signal output end is electrically connected to the electronic control board.

2. The steering wheel angle sensor for a full hydraulic steering gear according to claim 1, characterized in that: The sensing unit is a magnetoresistive sensing structure.

3. The steering wheel angle sensor for a full hydraulic steering gear according to claim 2, characterized in that: The sensing unit is a magnetoresistive resolver. The magnetoresistive resolver is coaxially installed in the installation housing with the installation hole. The rotor of the magnetoresistive resolver constitutes the identification element, and the stator constitutes the sensing element.

4. A steering wheel angle sensor for a full hydraulic steering gear according to claim 3, characterized in that: The magnetoresistive resolver is a four-pole resolver.

5. A steering wheel angle sensor for a full hydraulic steering gear according to claim 1, characterized in that: One end of the connecting shaft facing the steering column is a first connection end connected to the output end of the steering column, and the end facing the steering gear is provided with a second connection end connected to the input end of the steering gear.

6. A steering wheel angle sensor for a full hydraulic steering gear according to claim 5, characterized in that: The first connection end of the connecting shaft is an internal spline tooth hole, and the second connection end is an external spline tooth shaft.

7. A steering wheel angle sensor for a full hydraulic steering gear according to claim 1, characterized in that: The installation housing is provided with a plurality of installation through holes. Corresponding positions on the steering column flange surface and the front cover surface of the full hydraulic steering gear are respectively provided with a plurality of installation holes. When the installation housing is installed on the steering column flange surface and the front cover surface of the full hydraulic steering gear, the installation through holes correspond to the installation holes one by one.

8. The steering wheel angle sensor for a full hydraulic steering gear according to claim 7, characterized in that: The installation housing is provided with a plurality of pre-assembly positioning holes. Corresponding positions on the steering column flange surface and the front cover surface of the full hydraulic steering gear are respectively provided with a plurality of positioning pins. When the installation housing is installed on the steering column flange surface and the front cover surface of the full hydraulic steering gear, the positioning holes correspond to the positioning pins one by one.

9. A steering wheel angle sensor for a full hydraulic steering gear according to claim 3, characterized in that: The rotor of the magnetoresistive resolver is respectively provided with a plurality of positioning posts. Corresponding positions on the connecting shaft are provided with a plurality of positioning holes. When the magnetoresistive resolver is installed on the connecting shaft, the positioning posts correspond to the positioning holes one by one.

10. A steering wheel angle sensor for a full hydraulic steering gear according to claim 6, characterized in that: The size of the internal spline tooth hole is adapted to the size of the output end of the steering column, and the size of the external spline tooth shaft is adapted to the size of the input end of the steering gear.

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